Someone on Reddit once said that their dog died of drinking puddle water because of the spores in the water, while I don't know if it's true it probably doesn't hurt to avoid.

My dogs line up to drink out of the water bowl in the crate despite there being fresh water in their other bowl. We call that the tasty secret prison water.

[–] norawibb@sh.itjust.works 6 points 1 year ago* (last edited 1 year ago)

Theres more than spores to worry about with as much industrial strength super cancer chemicals people put on their lawns these days

also antifreeze is a classic killer and its prob good to train your dog to only drink from the bowl and nothing else